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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f452a9c6ec6ae47acaa8305013da04f4630829ba9458d501e3c4c39ca203192' 
  AND token = '2OXy5oaFHAGSRohCc3s4jzXX8kZa87UEyrqVtt3DPnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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