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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aad7ad1365f37b6fbbbbff82cc2b19e0bafbe712eda15ae9094d9c56ae8ae67b' 
  AND token = 'w8zR8zH82Na5Lv7Q1DMveHlJHWDCdiOmZthhj6uLE/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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