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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58f0984b9672c9c7d3f9074a9bea1fc44943e21d40b91fd5f42b01ae203b1855' 
  AND token = '49uOSoG0CB2Lz4IgSe8kmOAuhjDRvjc3wkIcbp/Tro8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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