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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '347bdbb8a2afc449a61b79589cd843dcf687caf29bb1ce80c1a9be1fe973e6d1' 
  AND token = 'wt1q9n+U5t+V6apA11YuJo4x4+IxEznvFe3f0W1D+sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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