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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e76f1f37e538a33152e85664b8c2728e8715dc263d4979e444d8e320b38bc12' 
  AND token = '0zBjor0elSObCnFtO5Y/J3LWLo0OamRaQwAEwCkIE5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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