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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '177be87952bce1f937ee3a35df5d9fbd014cf6536f21645602c7d9651665c528' 
  AND token = 'idZvp/5jE+XNaIEFwX/JWwAymSL9UUfev2iJrF69K80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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