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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c366fd1f3c9b1a258623694dd3ed42ba3adebdec506e92dc8d3b25137e3b07a9' 
  AND token = 'Z8u+9MSVOpyQowGRRU/t7O6i1Rx+MEP/s7B4Uxyhm1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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