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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3827eeb019de570d2c76acc4fe8d74a9cdc31caa922f88b641de6f918250f664' 
  AND token = 'IlPZUM3j5CahK0vS3ia6iNYj0YoVdjrrU2HgnkTyZ3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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