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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2d7bbcd5458e8ff0bc41c028dddf4fc4e151f30d3da3143db1ae33f14ca5235' 
  AND token = 'hI7vmBZW8UsHbWsuB2q1LxziA8eAs9R+CzGWksX3NYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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