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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09d51844948f49e6db9d260dd8949b9ec89fc196c979d017fa66a9dc00b37ed4' 
  AND token = 'ZpVZkv/Ip29v3m2sRIp2FLTpiDEs6AyfeANGCXDjR58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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