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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e4150cfdfffa2cd83ec546c16635c0027f31f97ba5b09d5bffc5579ae8ad866' 
  AND token = 'u65ql/HIejaBXcy6GirN7RU8zkyo4eEfAUVu44YjAmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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