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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4d0e5c5e4d87ff17dd874c5a7d66b312f1c61b98b5ed6d770706010d5f205e3' 
  AND token = '2b5AhMRQigt9UCfLb1JguhwxR2dh0RF9WIobxBnMfnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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