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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfd51d8763bf3839b25ea6dc419018bd8a6e2bad01ade9515667d557db6cf3bf' 
  AND token = '61HRWoC0ekZRvGPNwuvYuIC98+mlwoCI7ZkR0uZwoJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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