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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a33e97bf740dbc2f29aa8fc6532ded0630a31b82b5d76ecd7a68a50c1bba5983' 
  AND token = 'JYFpq2VFnUK5Vf/g5fbCdzjaE6eeCr00fvHU1KLpQVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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