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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b3a23bc30bc74b56bffa4902f293caf3a33c7fb573049c0d87bce6be259dd00' 
  AND token = '8e35M5IOw3d5uB+OiQwDnWCUdoDDiMcOacQgTMd2HLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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