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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f42f3020a0a53b2e2e42d1e253bbbc3125ccad6dcd9f702e82a0a2e87a5ca76' 
  AND token = 'Zmf2HHHDpzgsUIiJ06LWJI2anU7SIsJom6uDdj63gvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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