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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3373e0dcaefa0914e63f40f7b4f5abe9677ad343aa3627a7090dcdf0f56edd8b' 
  AND token = 'CUQjX5EtxFVRQZTnANZ2scVYsyPeLmu0WssghDXIqD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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