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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4a88bd4db217f0ce3641d095281dbcfdb8e2411c3436e0431a920ed00ace96e' 
  AND token = 'ooEYv4Ni5s+DHLQ13aei0TLYRBFfzXQ6zwVANm9gGmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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