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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db0e3088b379f29e62a8408e0dfac0148a358de70ad2ebb7d8c2059dccd730b0' 
  AND token = 'FvgxUeV8JkwNAcEUEURAdEicCakzJA+jzrYzwGoYFxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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