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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e567707dba02d1d83bee9cdc15b4701566db2d3eef091fd8e7f393ba9378ceba' 
  AND token = 'gGMpKLyNgSHcNpX52ZjYgt42lY8uKkVhpxN6f6U6rkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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