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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29368eac8d67d83a4e6300adc3f2215a540602edbab2dec33d4451e8417be4f2' 
  AND token = 'BQMXb9d2l/zHDqylBkeu51CBQI9W2EMxM5PUEsZXV3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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