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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '246a72c1ab2c3e56ec86d1c12f85de48e392436d39c6fdf794804012d3c8c0b6' 
  AND token = '1gckDEr8L5mt0oFPY1TYDS2QZOAa8u1bb36FVtxhQ9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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