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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfdba9141c826a33c0c2f5c1f07f61de8b052e30dea0e18e27ee3dbbe4b088ee' 
  AND token = 'V4mGi/AaGa8Z3WtjPyCwO4XBmO9Ag6YeBX60R5e//2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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