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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c904c76f972ad2e4087867a2aee0509179fc53e0a2b3f34cbdb78225f1c45ae' 
  AND token = 'FxcDRloXsykIh2oHhRPvmMfdgATEv2j3Y9Gdgl4PFKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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