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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36476cf3c9a86dfaf1c18c062a6125adba50cdfdcd2dda5f3c7536878ead95db' 
  AND token = 'lidb78hjhTiXCnTZkUFZCmjzDSsSf6uJa3TTFLjwatE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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