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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96b1ec061e0d12fe0abe1d97d8c77007dffc51ede7b72310ec84151b120754c7' 
  AND token = '7Qkr4NqAmHIiio/4ZOG7W28WpLfvqzbg/UvGk+U/4uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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