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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6dc22291e19cd9f290dc59e7634ddf512c145a1a11be0e1a7f9c37cc67f0d82' 
  AND token = 'RRhs1VRBaAp0ji4cYpvERglWHB6ULU/9X/jIBjEcW3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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