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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8de681e7440dd99a45101073b181d684176da0ed86eb61ba44b99c0bdff0f958' 
  AND token = '1i2AeWOnpi5Y7ViBZJIEKRey2iE4uIpUjajuzEQ0aZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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