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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7615d3e8c8ec6cba0482fc88ce8d12758c10e518054b60867e8ad0318d891d91' 
  AND token = 'xfoyb41GZdDREF64T38AvlAOWNWtdKTXHJ57rQ8odVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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