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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4b3b46cfbb3ad954f5923295c4a1733d93cd2cdd7aeb20a8b2a7602883767e3' 
  AND token = 'dIUVHb9HCNmW2tRQ6wbofp9bm/930Xe6HUkWZYBKZQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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