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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5e74929b29880672ae9adc44cd3f9dd717d0032ac9c6a735f7c94d38925ea2b' 
  AND token = 'nEhRKF9MO1Ry4o49SQYG/LP0P4uMik2lGIpsFQk5L0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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