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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78891f05834b11fd234be7e13384383a7d965753b63c14b4128e20a714885282' 
  AND token = 'aVqiEnwZrbVWwToyF5sVBdrqZZRZl0RJeCXnq0/ynmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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