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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4ca03b8863b0b42380626734bc95e597fdb6edf3864d38e625cd5e6fc228856' 
  AND token = 'l1YUkFsr33hnNlZwH2gy/+LoXOsQj38cbARC0MA+9/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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