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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb93b12edfb16e5270bfeb12dd1c4081f57e7e8cff2a7327391119781c8fd2d6' 
  AND token = 'SKYOXjApcxrtPo6A4IXTEHxfTEd9FbCT2MOD47OEiHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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