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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c9eced2d928cf6658dd73daca4eb6300d2b568eb1992fa4f205ba0e3699c5d3' 
  AND token = 'TYVi2H3EW4SECC5qsmDZQ5utWmQLxwyTtUTOi4ESD1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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