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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '502c3fc5b12bad18473d97dcb480f37a77eefe45fdca14e5ad9f5a105fe4e3a7' 
  AND token = 'aYXAyys8jBPoIPBeoHuCErkDsVgB0MT8W5E+f170JYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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