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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '508454ba72e2bccf94e831b9f8eba731d2c6a99f349a6d49cf018c519f59c5ef' 
  AND token = '2yr9UPhysNL29ye9ZflK9zmR/+Eq3FMEYVaLRnTb+dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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