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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eae2c3e0be23631735323b47c51fa56a2d9737c436f146e127d0d92e5f821e82' 
  AND token = 'BSBf7oPoiT84+fZN8aruLVtzqg1ii4ZVy6bKb71hkDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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