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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e218af3ffd3f7612bc6dba79a9dcbcc3967580c9479d97891f7ec5cef4df866' 
  AND token = 'Vv3goHhSfMsAi5CSQsxGSBAIpRtVrsNIB5396U27aCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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