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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e61e26178435cd35f5b465890419e84a678096fedb7f3a4fa8e0aba80236739a' 
  AND token = '1YIqS9OXa31zA6eMX8NmYvEMjUtLbo5Pgxdgx9Y/wVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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