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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '628b5d95dc4f425eabe6d48e86b59024a18fd6bce761570b5b35832d170d3bf1' 
  AND token = '2uue57+GBtdVRgiATw6IjEAsNTlpqCzKcPCm5Ct8R3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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