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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e2fb7939875edfa5aeb0cdf0f9c0116964d1faee4a4e2278daa6ffdce8cb68f' 
  AND token = 'MyD3ZqMeCg3arKB/RGTqnLxPEXnBLC56hIQX2BM1VrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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