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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c9d56ed3748d0a99b74b2e1cd5b2e80d4e23d4f7a167c5aab645f01b788b846' 
  AND token = 'RMHKizH9tX4Vg8Br1v/H6PLdmtMdNMILP1BNILz6MnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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