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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd070aef12ae9b8f349a7a7d447cacc276521c67ec5a556adcd5ad1faf9adc1d0' 
  AND token = 'nFzgJVHNNTum0YxJAt8F6Kgd5toH0IedrpBF5xpqLHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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