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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3560d6a1ac074e402a8c14d1929a0955f5275994f6c59f0f7523360de5fe386' 
  AND token = 'aytHFODwee9Eb1WYLevr0NzRNYtOxd3fHnVdTtxMHWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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