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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0ac1af0fd848cbd1c6bf6cf7d7989036f6da0a0a2fa0378d0ee7e965cf0ab04' 
  AND token = 'fRrHoM50JdM4kgbD42VI+C/wzo5vq2lkwhv2LtwihEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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