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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c921ff88206760b3e2a7b2c0bb190bee42abd1e40167c0ac5bbf3d1f09035fa' 
  AND token = 'o+zZcxyfghmfvOMpjy73ll5DcGRiWdoT01wwRcBCPR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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