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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbfcd0c8236cff9b420cf9fae44404f41cf86c1bfa2adad11d75a31423b95427' 
  AND token = '9IVPVmcdnbFqMGYiMKQU8Jd2HH4axVOtOEXLE0nDkXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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