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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95eb93e56f3f5a581b6949e34e1495fa90033882543beea219211adfe3d9986e' 
  AND token = 'Ia4/Ct+Vq5WLPDiMnUWmdmePJqh08rcL1xo/eMQFXnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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