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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '561b39944ca3abe1546175232c62ef8f855a609e8d48415f0e51b95ff501444b' 
  AND token = '9aMUwN+CrZFwWImsQ3uYbQlv281lF+zYvAlqdXd35TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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