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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '039d8a0a29729eb7fffebac1f4556a5b573c1ce9c9027b217e18babdb1917936' 
  AND token = 'KYB+Zj2pRNjTZJ1zkncOfRB1bPsEeqsBiV9kH7z0pjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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