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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '336b31578f881b6ee9274c6bfdd975135aa674448981b94fb9b85a7883c4d74a' 
  AND token = 'P5wPo4hclhieR1SyGUxKckBl4vPwDYpWT7RI+AlAP/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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