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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18ef3b818fb88e15a27e8f0e6a76c341dd04c1ae434d1aee8cc57de5d7214f97' 
  AND token = 'XCWFNb6UWCfoAIBVArJjm84E672vvU4Lj/cYc2Ji2DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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