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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f869224ede5423bb52e4680d814dc1f525f62c75ab0027747247c1e992d77fc' 
  AND token = 'wzMkWhYkpB4/MBtcf++4OIz31+mmyBrAOkHG4FCle00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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