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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2200c6a2efa20a06d247c8383faef1d67bb46b770d9476fccb6eca9236c0421a' 
  AND token = 'eZlCohfJNe8s90bceUXrRHxRJsf8u/kmesy0evf9O6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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