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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4be07817d964b5894ee913bc2271e8816ee74a6da0e7fb6c2a59a5644f3ff260' 
  AND token = 'Ghofby7cN+Whrd295llbLfwaNjJUGnN7MHKqrItqhX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}