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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9b6e10d92a684e8b75e122dd8f7660f7c0218dde4e4e6f477789dff144ee212' 
  AND token = 'NNSswU9/mUpTjO0/V+kitI31T2d86UrxNQ7eBPLnDs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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