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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8ba38f99be983236d473d78f6351261e0fe6500b12ecfafaddba614502dfa7f' 
  AND token = '0LRCdn8p3ArrY8uBfp5VsyZ21k57GiLikDflhAA6X3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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